XSS in Yeswiki
CVE-2026-34598
YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Yeswiki — versions < 4.6.0
Weakness classification (CWE)
References
- github.com/YesWiki/yeswiki/security/advisories/GHSA-37fq-47qj-6j5j (Exploit, Vendor Advisory)
- github.com/YesWiki/yeswiki/releases/tag/v4.6.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34598?
- CVE-2026-34598 is a medium-severity vulnerability in Yeswiki, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-04-02.
- How severe is CVE-2026-34598?
- Medium severity. CVSS v3 base score is 6.1 out of 10.